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pvc dwv

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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pvc dwv

Unread postAuthor: jbeeson » Sun Feb 27, 2011 10:05 pm

i have been look around and all the pvc i can find is dwv fittings and cellular core pipe. any suggestions? how bad would it be to use those?
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Unread postAuthor: Zeus » Sun Feb 27, 2011 10:51 pm

It depends, I strongly dislike PVC due to it's fragmentation characteristics, in a spray & pray it "might" hold out, if you get a near perfect fueling ratio at some point it could give you many piercings, or it may not.

Try a plumbing supplier or agricultural supply store, they have a very good range sometimes. It wouldn't hurt to post an approximate location, just so we can help you better.

I can get 6 inch PN12 fittings and pipe at my local ag store, so such fittings are available, just a matter of looking in the right places.

A small ag store near me has the largest array of steel SCH 40 pipe I've seen, half the price of a hardware store too.
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Unread postAuthor: mark.f » Sun Feb 27, 2011 11:11 pm

Where are you looking, first of all? If you can't find the pipe and fittings you need at a local-type hardware store try a big-box place, and if you can't find them there check out some irrigation stores. You may have to do some running around.

For a combustion, DWV solid core pipe and fittings will be acceptable. For a pneumatic, you must use pressure rated pipe and fittings. Your location would help a lot.
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Unread postAuthor: Technician1002 » Mon Feb 28, 2011 12:50 am

Is the Cellular Core stuff PVC or ABS? If it is ABS the testing I have done can be seen in the thread in my sig below. I know.. Shameless self promotion... :roll:
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Unread postAuthor: jrrdw » Mon Feb 28, 2011 7:13 am

Try here.
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Unread postAuthor: jbeeson » Mon Feb 28, 2011 9:39 pm

i found some pressure rated pvc and pressure rated couplings. the couplings are quite expensive so i think i will use those for the elbows and use dwv for the simple couplings not receiving much stress
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Unread postAuthor: Technician1002 » Mon Feb 28, 2011 9:40 pm

It is only as strong as it's weakest part.
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Unread postAuthor: mark.f » Mon Feb 28, 2011 10:43 pm

He's referring to the stress placed on the elbows due to recoil when firing, not pressure.
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Unread postAuthor: jbeeson » Tue Mar 01, 2011 4:36 pm

actually i was thinking that because the majority of a simple coupling's area is reinforced with the pipe it is attached to there is a fractional area on each coupling actually receiving any pressure. in contrary on the elbow they have a larger area not directly reinforced by the pipe therefore more potential area subjected to the pressure generated when firing.
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Unread postAuthor: Gun Freak » Tue Mar 01, 2011 6:44 pm

There is some truth in that but it is just as unsafe in my mind. Doesn't matter how much is exposed... what matters is that it is exposed.
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Unread postAuthor: jimmy101 » Tue Mar 01, 2011 7:39 pm

Cell core pipe is fine for even an advanced combustion gun, as long as it is at 1X. It'll handle the ~130 PSIG max pressure that a jammed round would produce.
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